Dash-pot.



'F. W. HILD.

DASH POT.

APPLICATION FILED JULY19, I9I7-' 1 ,273,059. Patented July 16, 1918.

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FREDERIC W. HILD, 01 DENVER, COLORADO.

DASH-POT.

Specification of Letters Patent.

Patented July 16, 1918.

Application filed July 19, 1917. Serial No. 181,564.

do declare the following to be a full, clear,

and exact description of the invention, such as will enable others skilled in the art to Which it appertains to make and use the same, reference being-had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in dash pots and my object is to construct a device of this character whereby theelement or elements it is adapted to control can be held normally in a given position and when it is desired to impart movement to the element or elements, as the case may be, such movement will be retardedto a considerable degree and the degree of retardment can be regulated.

Briefly stated, niy construction comprises a casing whose interior is divided into two compartments by a partition having openings therethrough and a rod extending through the interior of said casing and having two pistons secured thereon, the pistons being so mounted upon the said rod that one will be located in each compartment. Also located in each compartment and between each piston and the respective heads of the casing is a coiled spring. The remaining portion of each compartment, that is, the portions between the pistons and the partition, are normally filled with liquid and the two compartments are in communication by means of an opening formed in the said partition, the quantity of liquid being such as tofill all space between the pistons.

Means is also provided for regulating the flow of liquid through the opening of the partition.

I am aware that heretofore fluid and springs have been employed in dash pot constructions, but I do believe that my particular combination and arrangement of springs used in connection with liquid as above briefly set forth, is novel. I

Having briefly outlined my improvement, 1; will proceed to describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof. In this drawing Figure 1 is a longitudinal section of my improi'ed construction showing the connecting rod moved to the right. I

Fig. 2 is a similar view showing the connecting rod moved to the left.

Fig. 3 is also a. similar view showing the connecting rod in its normal position.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a cylindrical casing provided with a central partition 6 having openings 7 and 8'therethrough, the wall of the opening 7 being slightly recessed as disclosed at 9 to receive the lower extremity of an adjustable screw 10 mounted in a perforation formed in the casing, the said perforation being in communication with the opening 7 of the partition 6.

The opposite extremities of the casing 5 are provided with circumferential flanges 12 and 13 and head plates H and 15 are respectively secured to said flanges by means of bolts 16.

Each of these head plates has a centrally located opening 17 formed therein, these openings 17 being in alinement with the opening 8 of the partition 6, the said openings adapted to receive a rod 18 which extends through the casing. This rod is slidably mounted in the casing and projects beyond both extremities of the latter, its opposite extremities being threaded to receive adjustable fittings 19 which are screwed thereon.

r The partition 6 divides the interior of the easing into two chambers or compartments 20 and 21 which are in communication with each other by means of the opening 7 in the said partition. Pistons 22 and 23 are respectively located in the chambers 20 and 21, the said pistons being secured to the rod 18 as disclosed at 24 and normally occupying the positions shown in Fig. 3. In the chambers 20 and 21 and between the pistons '22 and 23 and the respective heads of the casing are located coiled springs 25. Springs of equal strength are shown in Fig. 3, but it must be understood that springs,

of varying strength may be employed with-- out changing the function of the device.

The opposite extremities of each spring 25.

filled with liquid, the quantity of liquid being sufficient to occupy all space between the said istons and this space including the opening in the partition 6.

In view of the above description, it is believed that the use and operation of my improved construction will be readily understood.

The elements with which the fittings 19 at the opposite extremities of the rod 18 are connected will, under normal conditions, be

' held in a given position and this. position will be retained even though some obstacle is encountered which would have a tendency to impart a sharp jerk to the elements and rod 18, since it is impossible for the pistons 22 and 23 to move quickly in either direction, as liquid is non elastic and the .said pistons cannot travel any faster than the water will pass through the opening 7 from one chamber into the other, and in view of the size of the opening 7. and the position of the regulating screw 10, it is not possible for the liquid to pass rapidly through said' opening.

Thus when an obstacle of the above described. nature is encountered, the elements with which the dash pot is connected will remain substantially in their normal position. Y

However, when force is applied to the rod 18 to move it in either direction, the movement will be slow or retarded, since as before mentioned the pistons 22 and 2.3 can only travel as fast as the liquid passes from one chamber to the other and the degreeof slowness can be regulated by adjusting the screw 10 which is adapted ,to project into the opening-7 formed in the partition 6.

When the force applied to the rod 18 is withdrawn, the pistons will automatically return to their normal position (which is disclosed in Fig. 3), in view of the fact that the springs 25 will then be free-to assume their normal positions which they will do automatically thereby balancing the structure. It will, of course, be understood that this return movement will also be slow or retarded for the same reason that the initial movement was.

' chambers said rod, one being Having thus described my invention, what I claim is:

A dash pot comprising a casing, a part1t 1on provided with an opening located in said casing and dividing the interior of the latterv into two compartments, a rod slidably mounted in the casing, pistons mounted upon said rod, a piston being located in each chamber, springs also located in the said between the pistons and the respectlve heads ofthe casing, and the space between the said pistons adapted to be filled with liquid.

2. A dash pot comprising a casing, a partition provided with an opening located in said casing and dividing the interior of the latter into two lating the size tion, a rod slidably mounted in the casing and pro ecting beyond both extremities thereof, plstons mounted upon said rods, a plston being located ineach chamber, SPI'lIlgS also located in the said chambers between the plstonsand the respective heads of the casing, and the space between the said p stons adapted to be filled with liquid.

.A dash pot comprising a casing, a part1t 1on provided with an opening located in sald casing and dividing the interior of the latter 1nt0 two' chambers, a rod slidably mounted in the= casing and projecting beyond 'both extremities thereof, adjustable fittlngs applied to the opposite extremlties of the said rod, pistons mounted upon the latter, one being located in each chamber, sprmgs also located in the saidchambers between the pistons and the respectiveheads of the casing, and the space between the said pistons adapted to be filled with liquid.

4. A dash potcomprising a casing, a partition provided with an opening located in said casing and dividing the interior of the latter into two communicating chambers, adjustable means mounted in the wall of the casing adapted to project into the opening in the said partition, a rod slidably mounted in the casing and projecting beyond both extremities thereof, pistons mounted upon located in each chamber, springs also located in the said chambers between the pistons and the respective heads of the casing, and the s ace between the said pistons adapted to be lled with liquid.

In testimony whereofI aflix my signature.

FREDERIC W. HILD.

chambers, means for reguof the opening in the parti- 

